Home >> Subaru >> 2021 >> Ascent Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostics) (3 Of 4) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P1134: A/F/O2 Sensor Bank 1 Sensor 1 Serial Peripheral Interface (SPI) Communication >> General Description >> Execution Condition